What are the specs for this Control Board?

The correct replacement for Tempstar model T4H736GKD200 — Heat Pump Defrost | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number T4H736GKD200 — Heat Pump Defrost | Ships Today.

Is this control board compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar Defrost Control Board for T4H736GKD200 — Heat Pump Defrost | Ships Today

Name: Tempstar Defrost Control Board for T4H736GKD200 — Heat Pump Defrost | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 145.00 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This is a genuine OEM defrost control board (part number 1173636) for the Tempstar T4H736GKD200 heat pump. In heating mode the outdoor coil collects frost, and the defrost board monitors coil temperature and run time to decide when to run a defrost cycle. When it initiates defrost it energizes the reversing valve, stops the outdoor fan, and briefly runs the unit in cooling mode to melt ice off the coil, then returns to heating. A failed defrost board causes a heat pump that ices over and loses heating capacity, never defrosts, defrosts too often, or fails to control the outdoor fan and reversing valve correctly. Because the board ties together the fan, reversing valve, and timing logic, a fault here can mimic several other failures, so verifying the board is a common diagnostic step. The correct OEM board restores proper defrost timing and protects the coil and compressor.

Specifications

Spec	Value
OEM Part Number	1173636
Type	Defrost Control Board
Brand	Tempstar
Control Voltage	24V
Function	Defrost Timing / Reversing Valve & Fan Control
Fits Model	T4H736GKD200

Compatibility

Factory-spec for the Tempstar T4H736GKD200 heat pump and shared ICP / Heil heat pump platforms using the same defrost board and sensor harness. Match the OEM part number and connector layout before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the condenser control-box service panel.
Document — Photograph every connector and the defrost sensor location before unplugging.
Remove — Unplug the harness connectors and unscrew or unclip the old board from its standoffs.
Install — Mount the new board, reconnect each harness and the defrost sensor exactly per your photo, and set any jumpers to match.
Test — Restore power, force or observe a defrost cycle, and confirm correct fan, reversing valve, and timing behavior.

Signs You Need a Replacement

Outdoor coil ices over and heating capacity drops
Heat pump never enters defrost or defrosts far too often
Outdoor fan or reversing valve not controlled correctly during defrost
No board LED activity or visible scorching on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

Tempstar Defrost Control Board f...

$145.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4H736GKD200 — Heat Pump Defrost | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4H736GKD200 — Heat Pump Defrost | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the control board on my Tempstar T4H736GKD200 — Heat Pump Defrost | Ships Today?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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